﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;

namespace Xceed.Silverlight.DataGrid
{
  internal sealed class TaskInhibitor
  {
    #region Constructor

    internal TaskInhibitor( Action task )
    {
      if( task == null )
        throw new ArgumentNullException( "task" );

      m_task = task;
    }

    #endregion

    internal void Run()
    {
      if( !m_flag.IsSet )
      {
        m_task.Invoke();
      }
    }

    internal IDisposable Prevent()
    {
      return m_flag.Set();
    }

    #region Private Fields

    private readonly Action m_task;
    private readonly InhibitorFlag m_flag = new InhibitorFlag();

    #endregion
  }
}
